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Omron CJ1W-ID231 32-point 24 VDC input unit — front view showing the Fujitsu FCN-361J040-AU 40-pin connector on the front face, with the orange LED status indicator row visible above the connector

Omron CJ1W-ID231 — 32-Pt DC Input, Fujitsu Connector

SKU: CJ1W-ID231

USD 45.00

CJ-series 32-point 24 VDC digital input unit with Fujitsu/OTAX 40-pin connector for high-density bulkhead wiring. 4.1 mA per point, 5.6 kΩ impedance, 16 points per common, 8 ms ON/OFF response time.

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Product Overview

The CJ1W-ID231 is Omron's 32-point 24 VDC digital input unit for the CJ-series PLC platform, the high-density sibling of the 16-pt CJ1W-ID211 (already done in our catalog). It uses a single Fujitsu FCN-361J040-AU 40-pin connector (or compatible OTAX N360C040J2) on the front face, accepting the standard G79-O@@@ pre-wired cable assembly or any third-party FCN-361J040-AU breakout — which lets you land 32 inputs in a 31 mm DIN-rail slot, half the panel width of two CJ1W-ID211 units side-by-side. This makes the CJ1W-ID231 the right pick for I/O-dense panels where DIN-rail space is at a premium — typically pick-and-place machines, robotic work cells, and any cabinet where 32+ inputs need to land in a constrained footprint.

Decoding CJ1W-ID231 within the ID2xx family

The CJ1W-ID@@@ model code follows: __1_ = 16-pt for ID2_1_ / 32-pt for ID2_3_ / 64-pt for ID2_6_; _X = connector type (1 = removable TB for ID211, 1 = Fujitsu for ID231/ID261, 2 = MIL connector for ID232/ID262); __1_ = standard (vs 2 = high-speed, 3 = high-speed MIL). The ID231 codepoint thus decodes as 32-point standard DC input with Fujitsu connector.

Why a Fujitsu connector instead of a removable TB?

The 32-pt density forces a hard choice: a removable screw terminal block with 33+ terminals in a 31 mm wide unit would be technically possible but mechanically awful — the terminals would be 5 mm apart, the wire entry would be unreachable when the unit is mounted between two other units, and the wiring time would be 3-4x longer than a connectorized alternative. So the CJ1W-ID231 uses a Fujitsu FCN-361J040-AU 40-pin socket (a polarized ribbon-style connector with crimp-on sockets), accepting the Omron G79-O@@@ pre-wired cable assembly (pre-stripped and labeled leads on one end, FCN connector on the other).

Compatibility with input filter and quick-response settings

On a CJ2-series CPU, the CJ1W-ID231 input filter is set in the PLC Setup: 0 / 0.5 / 1 / 2 / 4 / 8 / 16 / 32 ms selectable. The default 8 ms is the right pick for limit-switch, push-button, and E2E-X inductive sensor inputs — those signals have plenty of edge duration. For high-speed inputs (registration-mark detection, encoder Z-pulse, high-speed object counting), the engineer should pick the CJ1W-ID233 (32-pt HIGH-SPEED with MIL connector) instead — it supports 15 µs quick-response on inputs 0-7, plus interrupt-input assignment on the CJ2 CPU.

Key Features

  • CJ-series 32-point 24 VDC digital input unit
  • Fujitsu FCN-361J040-AU 40-pin connector on the front face for high-density bulkhead wiring
  • Compatible with Omron G79-O@@@ pre-wired cable assemblies
  • Compatible with CJ1M, CJ2M, CJ2H, and NJ-series CPUs
  • Bidirectional optocoupler input — NPN sink or PNP source field devices accepted
  • 24 VDC rated input
  • 5.6 kΩ input impedance, 4.1 mA typical input current at 24 VDC
  • ON threshold 14.4 VDC min / 3 mA min
  • SKU: CJ1W-ID231
  • Series: CJ1W I/O Basic Units (CJ-series expansion I/O)
  • Voltage: 24 VDC
  • I/O: 32 I/O

Best-Fit Applications

  • Limit-switch / proximity-sensor aggregation on a pick-and-place gantry — 32 inputs from 4 axes, each axis contributing 8 sensors, all.
  • Push-button + selector-switch panel on a packaging machine operator console — 32 inputs from 16 push-buttons + 16 selector switches.
  • Pneumatic-cylinder position feedback on a bottling line — 32 reed-switch or magnetic-position-sensor inputs, allowing the PLC to verify each cylinder's.
  • Encoder-Z and home-position inputs on a multi-axis servo system — 32 inputs from 4 servo axes, all aggregated on CJ1W-ID231.

Buying Checklist

  • Pick CJ1W-ID231 for 32-pt 24 VDC standard input with Fujitsu connector — high-density panels where DIN-rail space matters
  • Pick CJ1W-ID211 for 16-pt 24 VDC input with removable TB — easier field-wiring, one-off service, lower up-front cost
  • Pick CJ1W-ID212 for 16-pt HIGH-SPEED 15 µs quick-response input — for registration-mark detection, encoder Z-pulse, high-speed event capture
  • Pick CJ1W-ID232 for 32-pt MIL connector — same density, MIL connector for US-style mil-spec wiring schemes
  • Pick CJ1W-ID233 for 32-pt HIGH-SPEED MIL connector — supports both 15 µs quick-response and interrupt-input assignment on CJ2 CPU
  • Pick CJ1W-ID261 for 64-pt Fujitsu connector — for very-high-density panels

Technical Specifications

Model CJ1W-ID231
Series CJ1W I/O Basic Units (CJ-series expansion I/O)
Type 32-point 24 VDC digital input unit, Fujitsu connector
Input Points 32 points
Common Configuration 16 points per common (2 commons per unit — word 1 = CH0-15, word 2 = CH16-31)
Connector Type Fujitsu FCN-361J040-AU 40-pin socket (compatible OTAX N360C040J2); 1 connector per unit
Recommended Cable Omron G79-O@@@ pre-wired cable assembly (sold separately)
Rated Input Voltage 24 VDC
Operating Voltage Range 20.4 to 26.4 VDC
Input Impedance 5.6 kΩ
Input Current (typical at 24 VDC) 4.1 mA per point
ON Voltage / ON Current 14.4 VDC min / 3 mA min
OFF Voltage / OFF Current 5 VDC max / 1 mA max
Interrupt Input Capability NOT supported (use CJ1W-ID233 for interrupt-input assignment on CJ2 CPU)
Internal Current Consumption 90 mA at 5 VDC (from CJ bus)

FAQ for CJ1W-ID231

What's the difference between CJ1W-ID231 and CJ1W-ID211?
Both are 24 VDC digital input units for the CJ-series PLC. The differences: (a) Density — ID211 has 16 points in a 31 mm wide slot, ID231 (this SKU) has 32 points in the same 31 mm width. (b) Connector — ID211 uses a removable M3 screw terminal block (PHOENIX/COMBICON-compatible), ID231 uses a Fujitsu FCN-361J040-AU 40-pin connector. (c) Filter — both have 8 ms default with 0-32 ms selectable.
Does the CJ1W-ID231 support quick-response inputs on a CJ2 CPU?
No — the CJ1W-ID231 is a standard-speed input unit. Quick-response input (15 µs ON / 90 µs OFF) and interrupt-input assignment is supported only on the high-speed input units: CJ1W-ID212 (16-pt removable TB), CJ1W-ID233 (32-pt MIL connector), CJ1W-INT01 (legacy 16-pt interrupt-only unit).
What cable assembly do I need for the CJ1W-ID231?
The CJ1W-ID231 accepts a Fujitsu FCN-361J040-AU 40-pin connector on the front face. The standard Omron accessory is the G79-O@@@ pre-wired cable assembly (available in 1, 1.5, 2, 3, 5, 7, and 10 m lengths), which has the FCN-361J040-AU connector on one end and free leads on the other for landing on a remote terminal block. For users who want a MIL connector on the field side, Omron also offers the G79-O@@@-M@@ (Fujitsu to MIL break-out) but this is rarer.
Can I use the CJ1W-ID231 with both NPN and PNP sensors on the same unit?
No — all 32 inputs on the CJ1W-ID231 share one common terminal per 16-point group (2 commons total per unit), so each 16-point group references the same polarity. If you wire COM-1 to +24 VDC, the 16 inputs in that group (CH0-15) accept NPN sink-output sensors. If you wire COM-2 to 0 V, the 16 inputs in that group (CH16-31) accept PNP source-output sensors.

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